Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04d4ae7ab60ba99…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 12:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58b3115c0aa38398e4526b927c22908e SHA-1: 9a05c62fb54cff116c6053025719498dd2dc728a SHA-256: c04d4ae7ab60ba9903f273348a090a20606c3af2ca9d655f91e538a23efdd773
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while numerous, do not provide a clear second-stage payload, but their association with compromised sites is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://pathtojanna.com/userfiles/files/51929992634.pdf In PDF document text
    • http://mientaytourist.com/uploads/files/25608077183.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386bb92ea86---26472958195.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/19405589559.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vixotuvesitojarane.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/27312176838.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/54442506123.pdfIn PDF document text
    • http://canoeing.by/pics/files/5240301731.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/32136324023.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/pabolanawidugizi.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/jusuliduruwuxun.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/67793181037.pdfIn PDF document text
    • https://mkontroll.hu/File/zuneniwumalefovez.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/jiwutezonadivopawamijev.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/887bfdb9d9f1f93b5cecc3bc05099029/wereludigazikakiwogarewa.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/winej.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/35322755357.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/42731265208.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/ditusevugizupoka.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/22402212451.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136fdafe8757---12170278461.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210904025358763.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/kimegowixudizinosub.pdfIn PDF document text
    • https://zagi.hr/files/96453042962.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613507f75b511---82510619673.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/18855357186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bhagavad+gita+for+daily+living+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32D 18384 bytes
SHA-256: b097d2c0ead15befe265d391dc73cb4545db3c1880d8e259144e4e313942183a
font_01_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 10708 bytes
SHA-256: 3b28b682468864a3b40e86143c0ae554484e95eb7071416f615d6502964df09a
font_02_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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